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N. PETERS. Fnqwumu m hur. Washington, D c.

UNITED STATES PATENT OFFICE.

WARREN P. HARTHAN, OF WORCESTER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TOHENRY J. JENNINGS, OF SAME PLACE.

STEAM-HEATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 353,451, dated November30. 1886.

Application filed June 25, 1885. Serial No. 169,731.

(No model.)

To aZZ whom it may concern.-

Be it known that I. WARREN P. HARTHAN, a citizen of the UnitedStates,residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented certain new and useful Improvements inSteam-Heating Apparatus; and I do hereby declare that the same are fullydescribed in the following specification and illustrated in theaccompanying drawings.

This invention relates to improvements in steam-heating apparatus, andit is carried out as follows, reference being had to the accompanyingdrawings, where- Figure 1 represents a central longitudinal section ofthe invention. Fig. 2 represents a horizontal section on the line A B inFig. 1, showing the outer annular shell, the annular boiler, and centralmagazine or hopper for feeding the fuel to the grate, and Fig. 3represents a plan view of the grate, the outer annular shell, boiler,and central hopper being removed.

Similar letters refer to similar parts Wherever they .occur on thedifferent parts of the drawings,

a is the ash-pit, on the top of which rests the annular plate b, thatserves as a support for the annular boiler c c and the annulardouhlejacket d d, as shown in Figs. 1 and 2. The annular boiler ispreferably made conical, with its smaller end at top, as shown in Fig.1, and is composed of two annular shells,cand 0', located a smalldistance apart, so as to heat the water and generate steam'very quickly.

0 is the outer shell, and cisthe inner shell,of the boiler, such shellsbeing riveted together in their upper and lower ends, as shown. Thelower end of the annular boiler c o rests on or is secured to theannular plate b,on top of ashpit a, as shown in Fig. '1.

b is an annular rib projecting upwardon the upper side of plate I), asshown in Fig. 1. To prevent the heat from boiler c a from radiating intothe cellar or other room in which the heating apparatus is located, Isurround the boiler with a double jacket composed of two annular shells,d'and d, of which d is the outer one and d is the inner one, as shown inFigs. 1 and 2, with an air-space between the said shells to prevent heatradiation. The

lower ends of said shells d and d fit on the outside andinside,respectively,of the annular rib b on plate I), and may be rivetedor otherwise secured thereto, if so desired.

e is the top plate of the jacket (1 d, and it is provided on its underside with an annular rib, e, fitting between the shells d and d at theirupper ends, as shown in Fig. 1, and riveted or otherwise securedthereto. if desired. In the center of top-plate, e, is made aperforation that is covered by the detachable cover e,.

hinged or otherwise attached to plate a, and to results fromthe fuelwithout much waste of 7;

heat, and also to prevent the fuel from accumulating in the center ofthe fire-pot, as well as to increase the airspaces in the grate, Iconstruct the latter as follows: The grate is cast in one single piece.and has in its lower end an annular ring, f, from which extend thecurved or upwardly-tapering grate-bars f f which are united in theirupper ends by being cast in one piece with the central pivot-plate, f,(shown in Figs. 1 and 3,) such pivotplate extending into the fire-pot ator near the lower end of hopper E. f f are the air-spaces between ihegrate-barsff, as shown.

0n the under side of the pivot-platef is a recess, into which fitsloosely the central gratesupporting post, g, that is cast in one piecewith or secured at its lower end to the horizontal bar 9, provided atits rear end with a cross-bar, g, having trunnions g 9 that are looselysupported or otherwise hinged to bearings or brackets b b on plate I),as shown in Figs. 1 and 3. The forward end of the hori zontal bar 9 issupported in a hook or eye, h, in the link or bar h, that projectsupward through a slotted perforation, h in plate b, and has a lockingtooth or projection, h, adapted to rest on top of plate I), when thegrate is in its working position, as shown in Fig. 1. To the upper endof link or rod h is secured a handle, h by means of which the grate maybe operated to drop it down into the ash-pit when it is desired toremove clinkers, &c., or otherwise cleaning the grate, and to do this itis only necessary to push the rod h toward the jacket-shell dsufficiently to perniit the locking projection h to enter slot. b whenthe weight of the grate and its supporting-bar y will cause the latterto swing downward, on its trunnions g 9 into the ash-pit, when accessmay be had to any part of the grate, for the purpose set forth.

f is a radial projection on one side of the lower grate-ring, f,opposite a slotted perforation, a. in the side of the ash-pit. By meansof a suitable shaker, passed through the slot a and applied to theprojection fflthe grate may be oscillated on its fulcrum-post g in ahorizontal direction whenever it is necessary to shake the grate, andthis can be done with the greatest ease and without much frictionalresistance, as the grate is only supported in its central upper end uponthe post 9, and is perfgzctly free to move otherwise.

a is the air inlet or draft opening to the ash-pit a, such opening beingprovided with a suitable damper or valve, a, that may be regulated byhand or connected by means of a rod or wire, a (shown in Fig. 1,)to anysuitable automatic damper-regulator. From the jacket d d leads thesmoke-pipe D to a suitable chimney, and within said smoke-pipe isarranged the valve or damper D, that may be regulated by hand orconnected by means of a wire or rod, D, to any suitable automaticregulator.

In connection with the boiler c 0, I use the tank I, the lower part ofwhich serves as a reservoir, 2', for the feed-water, and the upper part,12, serves as a steam-drum to receive the steam from boiler c c. Fromthe lower end of tank I leadsa pipe, 2'", to the lower end of boiler cc, as shown in Fig. 1, and from the upper end of the latter leads thesteam-supply pipe 6 into the steam-space i of the tank I. As will beseen by reference to Fig. l, the upper end of steam-pipe i is made toenter tank I, so as to terminate above the level of the water therein,and thus to prevent the unpleasant noise usually made when steam has topass upward through a body of water.

i is the steam-delivery pipe leading from top of tank I to theradiators, as usual.

2' is a blow-off cock on pipe 4;, to be opened from time to time, asoccasion may require,

so as to withdraw sediment from the bottom of the boiler. Within thetank I is arranged an automatic feed-Water regulator, as shown inFig. 1. b

By the construction as above set forth and described I obtain severalimportant advantages in a steam-heating apparatus, among which may bementioned: The fuel is introduced at the top and directly within theannular boiler; the steam can be made very quickly and retained at thedesired pressure, and with a minimum of fuel; the waste heat isprevented from too rapid radiation in the room where the apparatus islocated; the grate will cause the ignited fuel to act on the interiorwall of the boiler to the best effect; abundant air-supply to the fuelis provided; the gratecan be shaken with a minimum of frictionalresistance and be let down in the ash-pit with great case, andunpleasant noises caused by the steam from the boiler passing throughthe feed-water is prevented.

Having thus fully described the nature, construction, and operation ofmy invent-ion, I wish to secure by Letters Patent and claim- 1. I11 asteam-heating apparatus, the annular double-shell boiler 0 c, annulardoubleshell jacket d d, top plate, 6, and base-plate I), combined withthe downwardly-projecting hopper E and upwardly-projecting gratesf f f,as and for the purpose set forth.

2. The combination of the annular plate 6, having ears b and opening bthe cross-bar g, journaled in said ears and having an arm, 9, providedwitha central grate-supporting post, 9, the grate-bars f f, having acentral pivotplate, 'f, and the holder h, extending through the openingb in the plate I), said holder being provided with an eye to engage theend of the arm 9, and having a lip, h, that rests on said plate,substantially as described.

3. The combination of the double-shell annular boiler c c, the doubleshell jacket d, having smoke-pipe D, the tank I, the pipe 2', leadingfrom the bottom of the tank to and through the double-shell jacket andinto the lower part of the annular boiler, and the steam-pipe i leadingfrom the upper part of the annular boiler through the jacket and intothe tank, substantially as described.

In testimony whereof I have affixed my sig nature in presence of twowitnesses.

WARREN P. I-IARTHAN. Witnesses:

M. A. GILL, HENRY J. JENNINGS.

